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| author | Steven Price <steven.price@arm.com> | 2020-05-13 18:37:50 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-09-04 14:46:07 +0300 |
| commit | 36943aba91860269abfba2e736e9534d48e90cae (patch) | |
| tree | 4fb2f58ccd9e8811cad36b712738f2afc5e7ebb0 /arch/arm64/include/asm/pgtable.h | |
| parent | 8a84802e2a2b1a682761a31c2685506b9f4e1840 (diff) | |
| download | linux-36943aba91860269abfba2e736e9534d48e90cae.tar.xz | |
arm64: mte: Enable swap of tagged pages
When swapping pages out to disk it is necessary to save any tags that
have been set, and restore when swapping back in. Make use of the new
page flag (PG_ARCH_2, locally named PG_mte_tagged) to identify pages
with tags. When swapping out these pages the tags are stored in memory
and later restored when the pages are brought back in. Because shmem can
swap pages back in without restoring the userspace PTE it is also
necessary to add a hook for shmem.
Signed-off-by: Steven Price <steven.price@arm.com>
[catalin.marinas@arm.com: move function prototypes to mte.h]
[catalin.marinas@arm.com: drop '_tags' from arch_swap_restore_tags()]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/pgtable.h')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 057c40b6f5e0..1c46fcd873f6 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -867,6 +867,38 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, extern int kern_addr_valid(unsigned long addr); +#ifdef CONFIG_ARM64_MTE + +#define __HAVE_ARCH_PREPARE_TO_SWAP +static inline int arch_prepare_to_swap(struct page *page) +{ + if (system_supports_mte()) + return mte_save_tags(page); + return 0; +} + +#define __HAVE_ARCH_SWAP_INVALIDATE +static inline void arch_swap_invalidate_page(int type, pgoff_t offset) +{ + if (system_supports_mte()) + mte_invalidate_tags(type, offset); +} + +static inline void arch_swap_invalidate_area(int type) +{ + if (system_supports_mte()) + mte_invalidate_tags_area(type); +} + +#define __HAVE_ARCH_SWAP_RESTORE +static inline void arch_swap_restore(swp_entry_t entry, struct page *page) +{ + if (system_supports_mte() && mte_restore_tags(entry, page)) + set_bit(PG_mte_tagged, &page->flags); +} + +#endif /* CONFIG_ARM64_MTE */ + /* * On AArch64, the cache coherency is handled via the set_pte_at() function. */ |